The Natural Cycles app has been reported to Swedish regulators after dozens of users fell pregnant by accident

The app – which tracks the menstrual cycle to tell users that it’s ‘safe’ to have unprotected sex – faces an EU ban if found to be defective.

It was originally approved as a contraceptive by regulators in Brussels last year, causing the number of British users to spike from 5,000 in 2016 to 125,000 in 2017.
The creators of the app claim it is as effective as the contraceptive pill, based on a study released in September last year.

Their findings, based on 22,785 women, appear to show that Natural Cycles was 93 per cent effective in preventing pregnancies.